Temperature rise prediction

[tca-adam]

hi all,

I am trying to predict the exponential heating of large electrical equipment that can typically take 6-8 hours to become stable.

What I would like to do, is to be able to predict the final temperature after a couple of hours of testing and am struggling to work out which VI to use that work similiar to trend and growth functions in excel.

I have attached my code that so far generates a typical heating curve that we see here during testing. My intention is to be able to calculate the first two hours of data and then use curve fitting or the like to give us a guess as to what the final temperature may be.

Any clues?

Thanks

Adam

[altenbach]

You could just do a nonlinear fit using your model formula. (see attached LabVIEW 8.0)

[p3]

Hello,
I am trying to do the exact same thing with a visual estimation of the temperature, however i only have labview 7.1 student edition.  Can someone please post a screen capture of the VI in the response?  Thanks

[altenbach]

Here is a converted 7.1 version. Coverting down created some insane errors, but I think it is running OK.

(The code contains some silly stuff, like the truncation of values to the formatted precision, etc., the only thing I added was the fitting node.) 😉

[kcorona]

Mr. altenbach

I would like to apply your prediciton algorith but i can't.

Could you help me?

Thanks

yskang.

[TMC-NI]

Hi kcorona,

I think the issue comes from how you are attempting to change the string into an array.  The array you are gathering only has time information therefore is not valid.  I would take the output from "Delete from array" and then delete the first column to get raw numerical data, and then input that into the curve fitting express vi.